### Home > GC > Chapter 8 > Lesson 8.1.4 > Problem 8-40

8-40.

Find the number of sides in a regular polygon if each interior angle has the following measures. Homework Help ✎

a. 60° | b. 156° | c. 90° | d. 140° |

Refer to the Math Notes box in this lesson to help you find the correct equation to use.

180°(*n* − 2) = 60°*n*

*n* = 3

Follow the same steps used in part (a) to solve parts (b), (c), and (d).